package reflection;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * setAccessible的使用
 * 对比所需时间
 */
public class Test10 {
    public static void test01(){
        User user = new User();
        long startTime = System.currentTimeMillis();//获取当前时间，标记为开始时间
        for (int i = 0; i < 10000000; i++) {
            user.getName();
        }
        long endTime = System.currentTimeMillis();//获取当前时间，标记为结束时间
        System.out.println("普通方法的时间："+(endTime-startTime));
    }

    public static void test02() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName",null);

        long startTime = System.currentTimeMillis();//获取当前时间，标记为开始时间
        for (int i = 0; i < 10000000; i++) {
            getName.invoke(user,null);
        }
        long endTime = System.currentTimeMillis();//获取当前时间，标记为结束时间
        System.out.println("反射方法的时间："+(endTime-startTime));
    }

    public static void test03() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class c1 = user.getClass();
        Method getName = c1.getDeclaredMethod("getName",null);
        getName.setAccessible(true);  //关闭检测。即：是否允许通过? true.

        long startTime = System.currentTimeMillis();//获取当前时间，标记为开始时间
        for (int i = 0; i < 10000000; i++) {
            getName.invoke(user,null);
        }
        long endTime = System.currentTimeMillis();//获取当前时间，标记为结束时间
        System.out.println("反射且关掉检测的时间："+(endTime-startTime));
    }

    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
        test01();
        test02();
        test03();
    }
}
